Device for sharpening lead and other pencils.



N0- 83 0,662. PATENT ED SEPT. 11, 1906.

H. A. H. GUHL.

DEVICE FOR .SHARPENING'L EAD AND OTHER PENCILS. APPLICATION FILED-JULY 14.1005.

THE NOIIIIJ PETERs co., wasnmcrcu, u. c.

UNITED STATES PATENT orrron,

DEVICE FOR SHARPEN ING LEAD AND OTHER PENCILS.

Specification of Letters Patent.

Patented Sept. 11, 1906.

Application filed July 14, 1905. Serial No. 269.653.

To all whom it may concern:

Be it known that I, HEINRICH AUGUST HERMANN GUHL, a subject of the German Emperor, and a resident of Hamburg, in the German Empire, have invented certain new and useful Im rovements in Devices for Sharpening Lea and other Pencils, of which the following is a specification.

This invention relates to a machine for sharpening lead and slate pencils and crayons by means of rotary disk cutters, for which purpose a chuck having a conical interior for the end of the pencil to be shar ened is arranged adjacent the cutter an allows the end of the rotating pencil which is to be sharpened to pass through a lateral slot in the same, so as to come under the action of the cutter-blades. Heretofore in such a chuck the end of the pencil has been so arranged that the pressure of the teeth or blades of the cutter acting on the end of the pencil could not, it is true, break the end of the pencil, but by means of the drawing out of the blades toward the point of the pencil a tearing away of the pencil end was not impossible, because the chuck does not eXert a sufficient protective counter-action in this direction. Under the present invention this drawback is avoided by arranging a cutter adjacent the chuck with the blades of the cutter so set to the chuck that their cut takes place against the end of the pencil, which is able to resist the same by means of its being mounted in the chuck. Since, then, only pressure efieets take place on the end of the pencil, and as these effects are taken up by the chuck, there is created a most advantageous combination of the chuck and the cutter.

In the accompanying sheet of drawings, Figure 1 is a longitudinal elevation, and F1g. 2 a plan, vpartly in section, of a sharpenin device constructed in accordance with and embodying my invention. Fig. 3 is a crosssection of the device on the line I II, Fig. 1.

carrying the interchangeable cutter h and mounted between center points. AXially slidable on the shaft 0, is a carriage c, fitted with a chuck or tubular guide n, which carriage carries a pinion n, engaging a pinion a, carried on the shaft a and secured by a feather and groove, while it can slide with the carriage on the said shaft. For guidin the carriage c a rail 1) is provided, which rai engages with an arm 0 of the sliding carriage.

The two ends of the pencil s which is to be sharpened are placed in the chuck n and guide g, and by turning the hand-wheel the chuck n and the cutter h are rotated, sharp ribs in the chuck constraining the pencil to rotate therewith. Through the aforesaid slot in the front internally-conical chuck or guide 9 the end of the rotating pencil s to be sharpened is passed into the range of the cutting-blades which sharpen the pencil. While being sharpened the pencil must be moved forward a little with gentle pressure, for which purpose the pressure of the finger on the carriage is sufficient.

The cutting edges or cutting-teeth of the cutter are preferably inclined or set at an angle to the radii of the cutting-disk, whereby even cutting and taking away of the splin ters or shavings is obtained. 1

For the reception of the fine splinters and dust there can be arranged at the side heneath the cutter a smalliremovable pan c.

Having fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a pencil-sharpenin machine, the combination with a conical, aterally-slotted guide-socket for the pencil ends to be sharpened, and means for rotating the pencil in said socket, and simultaneously permit the advancement thereof, of acutter-disk mounted adjacent to said socket to cut the pencil along the slot said cutter-disk having blades whose edges are at an acute angle to the radii of said disk and mechanism to rotate the disk to sweep the slot from its forward end rearward, substantially as described.

2. In a pencil sharpening machine the combination with aconical, laterally-slotted guide-socket for the pencil end to be sharpened, and means for holding the opposite end of the pencil, of gearing to rotate said means from the slot and cutting from the point of and slidable therewith along the shaft, said the rear, during the rotation of the pencil, shaft driving the gearing, a cutter-disk havsubstantially as described.

ing cutting-blades in its face at an acute an- HEINRICH AUGUST HERMANN GUHL. gle to the radii of the disk, means to siinul- VVltnesses: taneously rotate the shaft and disk, said MAX LEMOKE,

blades operating on the pencil projecting ERNEST H. L. MUMMENHOFF. 

